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<a name="boost.interprocess.named_recursive_mutex"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class named_recursive_mutex</span></h2>
<p>boost::interprocess::named_recursive_mutex</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_interprocess_reference.html#header.boost.interprocess.sync.named_recursive_mutex_hpp" title="Header &lt;boost/interprocess/sync/named_recursive_mutex.hpp&gt;">boost/interprocess/sync/named_recursive_mutex.hpp</a>&gt;

</span>
<span class="keyword">class</span> <a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// <a class="link" href="named_recursive_mutex.html#boost.interprocess.named_recursive_mutexconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="named_recursive_mutex.html#idp57293248-bb"><span class="identifier">named_recursive_mutex</span></a><span class="special">(</span><a class="link" href="create_only_t.html" title="Struct create_only_t">create_only_t</a><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span><span class="special">,</span> 
                        <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="named_recursive_mutex.html#idp57295744-bb"><span class="identifier">named_recursive_mutex</span></a><span class="special">(</span><a class="link" href="open_or_create_t.html" title="Struct open_or_create_t">open_or_create_t</a><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span><span class="special">,</span> 
                        <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="named_recursive_mutex.html#idp57299536-bb"><span class="identifier">named_recursive_mutex</span></a><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="named_recursive_mutex.html#idp57301072-bb"><span class="special">~</span><span class="identifier">named_recursive_mutex</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="named_recursive_mutex.html#idp57286128-bb">public member functions</a></span>
  <span class="keyword">void</span> <a class="link" href="named_recursive_mutex.html#idp57286336-bb"><span class="identifier">unlock</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="named_recursive_mutex.html#idp57287424-bb"><span class="identifier">lock</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="named_recursive_mutex.html#idp57289328-bb"><span class="identifier">try_lock</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="named_recursive_mutex.html#idp57291296-bb"><span class="identifier">timed_lock</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">ptime</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="named_recursive_mutex.html#idp57301680-bb">public static functions</a></span>
  <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="named_recursive_mutex.html#idp57301888-bb"><span class="identifier">remove</span></a><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp80146928"></a><h2>Description</h2>
<p>A recursive mutex with a global name, so it can be found from different processes. This mutex can't be placed in shared memory, and each process should have it's own <a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a>. </p>
<div class="refsect2">
<a name="idp80147968"></a><h3>
<a name="boost.interprocess.named_recursive_mutexconstruct-copy-destruct"></a><code class="computeroutput">named_recursive_mutex</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
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<pre class="literallayout"><a name="idp57293248-bb"></a><span class="identifier">named_recursive_mutex</span><span class="special">(</span><a class="link" href="create_only_t.html" title="Struct create_only_t">create_only_t</a> create_only<span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> name<span class="special">,</span> 
                      <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> perm <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre>
<p>Creates a global recursive_mutex with a name. If the recursive_mutex can't be created throws <code class="computeroutput"><a class="link" href="interprocess_exception.html" title="Class interprocess_exception">interprocess_exception</a></code> </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57295744-bb"></a><span class="identifier">named_recursive_mutex</span><span class="special">(</span><a class="link" href="open_or_create_t.html" title="Struct open_or_create_t">open_or_create_t</a> open_or_create<span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> name<span class="special">,</span> 
                      <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> perm <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre>
<p>Opens or creates a global recursive_mutex with a name. If the recursive_mutex is created, this call is equivalent to <code class="computeroutput"><a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a></code>(<code class="computeroutput"><a class="link" href="create_only_t.html" title="Struct create_only_t">create_only_t</a></code>, ... ) If the recursive_mutex is already created, this call is equivalent <code class="computeroutput"><a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a></code>(<code class="computeroutput"><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a></code>, ... ) Does not throw </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57299536-bb"></a><span class="identifier">named_recursive_mutex</span><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a> open_only<span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> name<span class="special">)</span><span class="special">;</span></pre>
<p>Opens a global recursive_mutex with a name if that recursive_mutex is previously created. If it is not previously created this function throws <code class="computeroutput"><a class="link" href="interprocess_exception.html" title="Class interprocess_exception">interprocess_exception</a></code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57301072-bb"></a><span class="special">~</span><span class="identifier">named_recursive_mutex</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Destroys *this and indicates that the calling process is finished using the resource. The destructor function will deallocate any system resources allocated by the system for use by this process for this resource. The resource can still be opened again calling the open constructor overload. To erase the resource from the system use remove(). </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp80172400"></a><h3>
<a name="idp57286128-bb"></a><code class="computeroutput">named_recursive_mutex</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp57286336-bb"></a><span class="identifier">unlock</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Unlocks a previously locked <code class="computeroutput"><a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a></code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp57287424-bb"></a><span class="identifier">lock</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Locks <code class="computeroutput"><a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a></code>, sleeps when <code class="computeroutput"><a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a></code> is already locked. Throws <code class="computeroutput"><a class="link" href="interprocess_exception.html" title="Class interprocess_exception">interprocess_exception</a></code> if a severe error is found. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp57289328-bb"></a><span class="identifier">try_lock</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Tries to lock the <code class="computeroutput"><a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a></code>, returns false when <code class="computeroutput"><a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a></code> is already locked, returns true when success. Throws <code class="computeroutput"><a class="link" href="interprocess_exception.html" title="Class interprocess_exception">interprocess_exception</a></code> if a severe error is found. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp57291296-bb"></a><span class="identifier">timed_lock</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">ptime</span> <span class="special">&amp;</span> abs_time<span class="special">)</span><span class="special">;</span></pre>
<p>Tries to lock the <code class="computeroutput"><a class="link" href="named_recursive_mutex.html" title="Class named_recursive_mutex">named_recursive_mutex</a></code> until time abs_time, Returns false when timeout expires, returns true when locks. Throws <code class="computeroutput"><a class="link" href="interprocess_exception.html" title="Class interprocess_exception">interprocess_exception</a></code> if a severe error is found </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp80190864"></a><h3>
<a name="idp57301680-bb"></a><code class="computeroutput">named_recursive_mutex</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idp57301888-bb"></a><span class="identifier">remove</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> name<span class="special">)</span><span class="special">;</span></pre>
<p>Erases a named recursive mutex from the system </p>
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